Read gap offset

ABSTRACT

A MAGNETIC HEAD SURFACE CONTOUR IS DEFINED BY TWO CONSTANT RADII. THE TWO PAIRS OF POINTS AT WHICH A MAGNETIC TAPE IS TANGENT TO THE TWO CONTOURS LOCATE TWO CENTER-OF-WRAP AT THE MIDPOINTS OF TANGENCY. THE TAPE PATH IS CONTROLLED TO GIVE TWO DIFFERENT TAPE WRAP ANGLES RELATIVE TO THE HORIZONTAL. A READ GAP, USED DURING BOTH FORWARD AND BACKWARD TAPE MOTION IS LOCATED AT BUT NOT PRECISELY ON, ONE OF THE CENTERS-OF-WRAP. A WRITE GAP, USED DURING WRITE OPERATIONS, IS LOCATED DOWNSTREAM (DUR ING FORWARD TAPE MOTION) FROM THE OTHER CENTER-OF-WRAP.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.6. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. m The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The dies of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED OCTOBER 30, 1973 T915,016 BIDIRECTIONAL MAGNETIC HEAD Tseng K. Chow and Arthur B. Wills, Boulder, Colo.,

assignors to International Business Machines Corporation, Armonk, NY. Continuation of abandoned application Ser. No. 179,866, Sept. 13, 1971. This application Apr. 26, 1973, Ser.

Int. Cl. Gllb 5/26 U.S. Cl. 340174.1 F 1 Sheet Drawing. 10 Pages Specification r 1 CKNYER 0F 7 ENTER 0F READ RADIUS i2 IRITE minus I! REiDCEIlEil CENiEfiSOF mm ADlllS SPACIKH3 w smmc 20 mu m orrsn 2ih-IRITE GAP orrssr 22 mo GAPARO 10-44 vmnz BAPARH9 mu m: commits--4 FIRITETAPECONTACTARHT Oct. 30, 1973 TSENG CHQW ETAL T915,016

BIDIRECTIONAL MAGNETIC HEAD Original Filed Sept. 13, 1971 1 CENTEROF CENTER OF READ RADIUS 42 WRITE RADIUS 13 1* READCENTER i CENTERS 0F OFWRAPM RADIUS SPACING 25 j J GAPSPACING 20 READGAPOFFSET24 WRITE GAPOFFSET 22 READGAPARC18-H WRITEGAPARC19 READ TAPE comer ARC 46' i i WRITE TAPE CONTACT ARC 47' 

